<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>base</title>
    <style>
        .box{
            background: pink;
            width:300px;
            height:200px;
        }
    </style>
</head>
<body>
    <div class = "box">
    {% block yang %}
        我是杨帆哥哥
    {% endblock %}
    </div>
</body>
</html>